<%@ page import="java.util.List" %>
<%@ page import="java.util.ArrayList" %>
<%@ page import="java.sql.*" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>

    <title>学生数据库</title>
</head>

<body>
<h1>这是一个JSP文件。</h1>
<%
    out.write("hello,world!");
    out.write("<h1>hello,world!</h1>");
    // out.write("怎么总是出现500");
%>

<style type="text/css">

    table {
        border: 1px solid #000;
        border-collapse: collapse;
    }

    td,tr{
        border: 1px solid #000;
        padding: 10px;
    }

</style>


<table>

    <thead>
    <tr>
        <th>编号</th>
        <th>用户名</th>
        <th>密码</th>
    </tr>
    </thead>




    <%
        class User {
            int id;
            String username;
            String password;

            // alt + insert
            public User(int id, String username, String password) {
                this.id = id;
                this.username = username;
                this.password = password;
            }
        }



        List<User> list = new ArrayList<User>();



        // 3 + 1
        Connection connection = null;
        Statement statement = null;
        ResultSet resultSet = null;

        String sql = "select * from t_users";

        Class.forName("com.mysql.jdbc.Driver");


        connection = DriverManager.getConnection(
                "jdbc:mysql://localhost:3306/sctu_javaweb_2018?serverTimezone=UTC",
                "root",
                "123456"
        );


        statement = connection.createStatement();

        resultSet = statement.executeQuery(sql);

        while(resultSet.next()){

            int id = resultSet.getInt(1);
            String username = resultSet.getString(2);
            String password = resultSet.getString(3);

            User user = new User(id, username, password);
            list.add(user);

        }
        resultSet.close();
        statement.close();
        connection.close();



        for (User user : list) {

            out.write("<tr><td>" + user.id + "</td><td>" + user.username
                    + "</td><td>" + user.password + "</td></tr>");
        }
    %>
    </tbody>

    <tfoot>
    </tfoot>
</table>

</body>
</html>
